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Stock-Based Compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at beginning of period (in shares)	8,657	12,558	23,231
Exercised (in shares)	(8,248)	(3,901)	(9,842)
Forfeited or expired (in shares)	(409)		(831)
Outstanding at end of period (in shares)	0	8,657	12,558
Weighted-Average Exercise Price
Outstanding at beginning of period (in usd per share)	$ 14.77	$ 14.77	$ 14.21
Exercised (in usd per share)	14.77	14.77	13.45
Forfeited or expired (in usd per share)	14.77		14.77
Outstanding at end of period (in usd per share)	$ 0	$ 14.77	$ 14.77

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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Weighted average price of options that were either forfeited or expired.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of share options (or share units) exercised during the current period.

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